CowboyStudio Full Spectrum CFL Fluorescent Light Grow Light Bulb 65 Watt Bulb 5500K One 65 Watt 5500 Kelvin compact fluorescent light bulb 65 watt fluorescent light bulb = 275 watt Incandescent light bulbs, Save 210 watts in energy over the life of the bulb Color temperature: 5500 K, daylight E26 standard screw-in base 8" Tall x 2 3/4" Wide